<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>19Vue中CSS原理(过渡动画效果)</title>
    <script src="./vue.js"></script>
    <style>
        .myTransition-enter,
        .myTransition-leave-to {
            opacity: 0;
        }

        .myTransition-enter-active,
        .myTransition-leave-active {
            transition: opacity 3s;
        }
    </style>
</head>

<body>
    <div id="app">
        <!-- <transition>  的意思是 它包裹的里面会有动画效果，Vue会自动的帮我们构建一个动画流程，可以给它取一个名字 -->
        <transition name="myTransition">
            <div v-if="show">hello world</div>
        </transition>
        <button @click="show = !show">change</button>
    </div>
    <script>
        var vm = new Vue({
            el: '#app',
            data: {
                show: true
            },
            methods: {
            },
        })

    </script>
</body>

</html>